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1990 70hp johnson probs

J

jono

New member
"Hello to all,this is my first

"Hello to all,this is my first post.
I have owned this motor since new and it has 95 hrs on it.It has never given me any probs until about a month ago.It started fine and would run no probs until i got over 4000-4500 rpm.It would then cut out,if I was quick enough to pull the revs back,then it would run all day.I used it today and it did the same thing.I shifted about 4 times fishing then went to start and it would spin over fine but no start.The fuel bulb was hard and all the fuel connections looked fine with no leaks.After about 5 mins I got it going by just touching the starter and letting the key back (if that makes sense ?)It played up a few more times and I started it the same way,but on the trip home (about 15 mins) I tried to get it to play up but it ran fine,even over 5000 rpm.My problem is that I have no confidence in it until I fix the prob.I am not sure if I am looking for An electrical or fuel prob.
sad.gif
Any ideas would be appreciated"
 
the basics are-
ck compressio

the basics are-
ck compression
ck spark
ck fuel delivery
are u disc fuel line and trying to run dry w/vro connected?...when was it last tuned up and de-carbed?...carbs/linkage and synchronization between carbs and ign good?..timer base moving fully to its stop?
 
"are u disc fuel line and tryi

"are u disc fuel line and trying to run dry w/vro connected?... I am not sure what you mean by this?
The system is running oil tank and fuel tank.
When eng.would not start I got a mate to hold fuel bulb tight,but it made no difference.
I haven't checked compression and it has never been de-carbed.Spark jumps a good 7/16 timer base moves freely and to it's stop.
Fuel delivery is something that I haven't checked. Is this easy to do ?
Thank you for your reply."
 
"ur eng has the blk plastic fu

"ur eng has the blk plastic fuel conn on end of fuel line,to conn to eng,right?....if u have been disc this,and 'running dry' the system,u potentially fill/or add a lot of oil to carbs,fuel lines etc,causing a very hard start as well as a smoky one...
fuel delivery,encompasses everything fr fuel tank thru carbs.,..pull a dr plug from bottom of carb bowls,if its brown covered,they need to be cleaned and rebuilt."
 
OK I will check this tomorrow

OK I will check this tomorrow and see what I find
I was also going to replace the complete fuel line as it is original.
thanks
 
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